Versatile Synthesis of Amine-Reactive Microgels by Self-Assembly of Azlactone-Containing Block Copolymers

Wang, Xu; Davis, Jesse L.; Aden, Bethany M.; Lokitz, Bradley S.; Kilbey, S. Michael

doi:10.1021/acs.macromol.8b00405

Title: Versatile Synthesis of Amine-Reactive Microgels by Self-Assembly of Azlactone-Containing Block Copolymers

Journal Article · 04 May 2018 · Macromolecules

DOI: https://doi.org/10.1021/acs.macromol.8b00405 · OSTI ID:1468208

^[1]; Davis, Jesse L. ^[2];

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Shandong Univ., Jinan (China). National Engineering Research Center for Colloidal Materials. School of Chemistry and Chemical Engineering; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry. Dept. of Chemical and Biomolecular Engineering

Relations between molecular design, chemical functionality, and stimulus-triggered response are important for a variety of applications of polymeric systems. In this paper, reactive amphiphilic block copolymers (BCPs) of poly(2-vinylpyridine)-block-poly(2-vinyl-4,4-dimethylazlactone) (PVP-b-PVDMA) were synthesized and assembled into microgels capable of incorporating functional amines. The composition of the PVP-b-PVDMA BCPs was varied to control the number of reactive sites in the spherical aggregates created by self-assembly of PVP-b-PVDMA BCPs in a 2-propanol/THF (v:v = 19:1) solvent mixture, which is selective for PVP. PVDMA and PVP segments were selectively cross-linked by 1,4-diaminobutane (DAB) or 1,4-diiodobutane (DIB) to fabricate core- and corona-cross-linked azlactone-containing microgels, respectively. Non-cross-linked aggregates of PVP-b-PVDMA and DIB-cross-linked microgels dissociate when exposed to THF, which is a good solvent for both blocks. However, the DAB-cross-linked BCP microgels swell in THF, suggesting the formation of a stable, three-dimensional network structure. Finally, because of their ability to be reactively modified in ways that allows their stability or disassembly characteristics to be tailored, these azlactone-containing BCP microgels provide an attractive platform for applications in a wide range of fields, including catalysis, imaging, molecule separation, and guest loading for targeted delivery.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Shandong Univ., Jinan (China)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF) (United States); Program of Qilu Young Scholars of Shandong Univ. (China); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1468208

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 10 Vol. 51; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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